dolhun



Sept. 16, 1958 L. M. DoLHuN 2 Sheets-Sheet'l n al?? Sept. 16, 1958 1 M.DoLHUN 2 sheets-#sheet 2 Original Filed May 15, 1951 l. mw

, 1N VEN TOR. leafzafdfyoZ/zfa,

United States Patent Oce Re. 24,536 Reissued Sept. 16, 1958 SEAL LeonardM. Dolhun, Chicago, Ill., assignor to Chicago Rawhide ManufacturingCompany, Chicago, lll., a corporation of Illinois Original No.2,701,154, dated February 1, 1955, Serial No. 226,415, May 15, 1951.Application for reissue January 30, 1957, Serial No. 639,596

17 Claims. (Cl. 288-3) Matter enclosed in heavy brackets appears in theoriginal patent but forms no part of this reissue specification; matterprinted in italics indicates the additions made by reissue.

The present invention relates to seals of the type cornmonly applied toa pair of relatively rotatable parts for the purpose of sealing theseparts against the escape of lubricant or other liquid, the undesiredentry of dirt and foreign matter, etc. ln particular, the inventiondeals with a seal for such an installation which is Whollyself-contained in character, in that it embodies in a pre-assembled unitboth a `sealing ring and a coacting mating ring against which thesealing ring is resiliently urged for relatively rotative slidingengagement at the meeting surfaces of the rings when the seal isinstalled.

It is an object of the invention to provide `a self-contained seal inwhich the sealing ring and mating ring are both received about anaxially extending tabular portion of a metal casing member in axiallymovable relation thereto, the casing member including a further portionwhich is provided with means for restraining the sealing ring againstrotation relative thereto, the casing member anchoring one edge of adiaphragm which along its opposite edge is attached to the sealing ring,the axially extending portion of the casing member being provided withlug-type means which project into the path of axial movement of themating ring and prevent axial separation of the mating ring from thecasing member in response to the action of spring means carried by thecasing member which urge the sealing ring into sealing engagement withthe mating ring.

It is [an] another object of the invention to provide a self-containedseal of the foregoing sort in which the sealstantial axial length andprovision on said portions .for interengaging the same to preventseparation ofthe casings from one another prior to installation oftheseal.

Another object of the invention, in one of its embodiments, is toprovide a self-contained seal including a pair of casings mounted inaxially telescoped relation to one another, one of said casings havingan axially extending, tubular portion or extension of sutlicient lengthto extend substantially entirely through the other casing, in thecompressed condition of the seal, for axial abutment withv a sealed partwhich is in fixed relation to the other casing, thereby serving as ameans to impart positive sealing thrust against a compressible gasketwhich is associated with the first-named, extension-bearing casingmember.

A still further object of the invention, in another embodiment thereof,is to provide a self-contained seal having axially telescoped,interengageable casing members, one mounting a sealing ring and theother mounting a mating ring, in which the rst named casing has an axialre-entrant portion providing circumferentially spaced axially extendinglug or key elements which interlock with the sealing ring to restrainrotation of the latter, the reentrant portion also serving as acentering means for an annular spring which acts between the casingmember and associated sealing ring to urge the latter against the matingring.

The foregoing statements are indicative in a general way of the natureof the invention. Other and more'specic objects will be apparent tothose skilled in the art upon a full understanding of the constructionand operation of v the device.

ing ring and mating ring are each individually mounted on a sheet metalcasing member in a non-rigid relation thereto which casing membersprovide an external housing for the seal enclosing its operating partsand have means for individually restraining the respective sealing andmating rings in a positive manner against rotation [relative to oneanother and] relative to [the] their respective casing members.

Yet another object is to provide a seal which is very economicallyproduced .and quickly and economically assembled as a whollyself-contained unit, as well as installed after assembly in operativerelation to a pair of relatively rotatable parts to be sealed, the sealbeing characterized by two telescoped casing members containingcoactingsealing and mating rings, of which the latter is relativelyloosely disposed in its casing member in order to avoid objectionablystressing the latter as might yoccur in force-fitting, and is keyed bythe casing rmember against relative rotation, being axially sustained bythe casing member under spring force applied through the sealing ring.'

A still further object of the invention is to provide a self-contained'seal of the foregoing character, in which the two coacting casingmembers -o`f the seal, each associated in llaterally enclosing relation'to one of vthe rings referred to above, have axially 'telescopedportions of sub- .housing and roller bearing-mounted shaft associatedwith the housing;

Fig. 3 is a view in longitudinal or axial section through the seal inaccordance with a modified embodiment of the invention, showing the samein expanded condition of its parts prior to installation; and l Fig. 4is a fragmentary view in section similar to Fig. 3, illustrating theseal of that iigure in an operative, linstalled relation to a shaft andhousing structure.

Referring to Figs. l and 2 of the drawings, the reference numeral 10generally designates a seal embodying in one form the principles oftheinvention, as for the oil and dust sealing -of a shaft 11 rotatablymounted at a bearing 12 in a housing 1'3 or the like. A shaft-carriedmember 14 is appropriately secured to the shaft, being spaced from thebearing 12 by a sleeve-like shim 15 which also rotates with the shaftand the inner race 13' of bearing 12.

Generally considered, the seal 10 is made up of an outer casing member16 in the form of a hollow, sheet metal stamping `of re-entrant,`,cupped cross-sectional outline; and inner, axially anged, deep drawnsheet metal casing member 17; a sealing ring 18 of bronze or othersuitable material and coacting steel mating ring 19 against which thesealing ring has relatively rotatable, running engagement at thevsealing surface 20; and a flexible diaphragm 21 `which is clamped atopposite marginal extremities thereof to'the sealing ring 1'8 and vtothe casing member 17 with which that ring is associated. Y

The outer casing member 16 is characterized by an outer axiallyelongated shell portion 22 which is of substantial length and has aslight radial offset adapted for frictional, force-fitted engagement ina recess 23 of the housing 13, or equivalent part to be sealed, asillustrated in Fig. 2. The 4remainder of the shell portion 22 serves tophysically protect the enclosed portions of the seal. A radial rear wall24 extends inwardly from the shell portion 22 and is in turn bentreversely at a right angle to form a re-entrant flange portion 25paralleling the shell portion.

The shell, rear wall and flange portions deue an annular space 26 inwhich the mating ring 19 is relatively loosely received, it being theobject to thus avoid undue stressing of the stamped casing member suchas would characterize a force-fitted engagement of the mating ring andlcasing member. A resilient compressible gasket 27 is interposed betweenthe rear of mating ring 19 and the rear radial wall 24 of the casingmember 16. The re-entrant ange portion 25 is terminally bent inwardly toform a continuous radially disposed restraining rim 28 for a purpose tobe described. The elements described constitute a mating ring assembly.The inner casing member 17 is shaped adjacent its outer periphery toprovide a circumferential channel or groove 30 which opens forwardly inthe axial direction, i. e., towards the mating ring 19. This channelreceives the radially flanged marginal rim 31 of the flexible diaphragm21, fabricated of rubber, synthetic rubber or the equivalent. A clampingring 32 is secured in the channel by an inturned edge on the rim of thelatter, the rounded nose thereof vengaging the diaphragm rim 31 andsecuring the same in fixed relation to the casing member 17. The othermargin of diaphragm 21 is appropriately secured to sealing ring 18, asby shaping the same in L-shaped outline and bonding the same in acorrespondingly relieved annular rabbet 33 on the rear and outersurfaces of the sealing ring. Thus diaphragm 21 serves to prevent entryof foreign matter or escape of lubricant or other material betweencasing member 17 and its associated sealing ring 18.

Casing member 17 extends integrally from the channeled portion 30 in theform of a rear radial wall 34, which in turn integrally joins aforwardly axially extending, tubular sleeve extension portion 35 whichis of substantial length. As illustrated, the extension 35 is sucientlylong to extend entirely through the opposed casing member 16 when theseal is operatively compressed in installed position (see Fig. 3). Thefree edge of the sleeve portion thus abuts the inner race 13 of bearing12, serving as a stop to determine the maximum compression of the seal,and also performing another important function, to be later described.Sleeve portion 35 surrounds the spacing shim 15 in axially spacedrelation to the latter.

The sealing ring 18 is resiliently urged against mating ring 19 by meansof a plurality -of uniformly distributed coil springs 36 whichrearwardly abut the radial wall of casing member 17. They extend throughapertures 37 formed in the radial portion of diaphragm 21 which isbonded to the sealing ring and are received in recesses 38 formed in therear of that ring.

The mating ring 19 and sealing ring 18 are each positively restrainedfrom rotation relative to the casing mem- Iber with which they areassociated, hence relative to the part to be sealed which is fixedlyengaged by that casing. In the case of the mating ring this function isperformed by a set of guide lugs 40, formed by slitting and outwardlyoff-setting the material of the re-entrant flange 25 of easing member16. These lugs are engageable in correspondingly spaced axial grooves 41formed on the inner periphery of mating ring 19. The relationship issuch that the mating ring is readily dropped into place in recess 26,the lugs slidably entering the grooves 41, and preventing in a positivefashion relative rotation of the mating ring and its casing inoperation.

The sealing ring 18 is restrained from rotation relative to its casingmember 17, in addition to the inherent restraining action of diaphragm21, by means of a series of axially extending pins 44 which are fixed onthe rear radial wall 34 of the casing member. These pins have forwardportions 45 which extend into correspondingly spaced small recesses 46formed in the rear of the sealing ring 18. The rear portions 47 of thepins are adapted to extend into and interlockingly engage withcorrespondingly spaced recesses 4S in the shaft-carried member 14against which the seal abuts, as illustrated in Fig. 2.

The last named pin portions als-o serve to center and support a separateannular compressible sealing gasket 49. It will be noted in Fig. 2 thatthe elongated inner tubular sleeve extension 35 of casing member 17 isabutted against the inner race of bearing 12 in the installation of theseal. This serves to compress the gasket 49 against the shaft-carriedpart 14, insuring a positively forced seal at that point, rather thanrelying yon the force of coil springs for the purpose. The primaryfunction of the latter is to urge the mating and sealing rings forrelatively rotatable engagement and to maintain the mating ring inaxially abutting relation to its casing member 16 when the seal is notin its operative installed position.

The casing members 16, 17 are held in assembled, unitary, axiallytelescoped relation to constitute the selfcontained seal construction bylug means [of] Ior small ears 42 which are slitted and struck outwardlyfrom the material of tubular sleeve extension 35 of casing member 17.These ears are engageable with the restraining rim 28 of the othercasing member, in the fashion illustrated in Fig. l, to preventseparation `of the casing members when one or both thereof is axiallyunsustained, as by the parts with which the seal 10 is associated.

Figs. 3 and 4 illustrate a modied embodiment of the principles of theinvention. The outer casing member 50 is adapted to be force-fitted in arecess 51 of a part 52 with which the seal is associated. Like thecasing member of the first embodiment, it is shaped to provide are-entrant annular Achannel 53 which receives the radially flanged outerrim of an annular flexible diaphragm 54. A separate, terminally rolledclamp ring 55 is force-fitted within the elongated, axially extendingportion 56 of casing member 50, engaging and clamping the rim of thediaphragm in the channel. The clamp ring is locked in place by aninwardly spun annular lip 57 on the right end margin of the casing.

Casing member 50 continues from the channel portion 53 in a form of aradially extending wall 58 and terminates in a plurality of axiallydisposed, circumferentially spaced segmental locking lugs 59 ofsubstantial width, as illustrated in Fig. 3. These have axially slidableengagement in similarly spaced axial grooves 60 formed lin the innerperiphery of the sealing ring 61. The outer periphery of the sealingring is provided with a circumferential groove or channel 62, in whichthe radially iu-turned margin of diaphragm 54 is fixedly clamped. Ring61 is preferably hardened only part way back from its running sealingsurface, leaving the zone adjoining groove 62 in ductile condition tofacilitate clamping of the diaphragm. The sealing ring 61 is axiallyguided on the locking fingers 59 during the operation of the seal, aswell as prevented from rotative movement relative to its casing member.

The aforesaid fingers 59 also serve to center in the space rearwardly ofthe sealing ring an annular finger spring 63 of known type,characterized by an inner annular body 64 and a plurality of resilient,circumferentially spaced spring fingers 65 which extend in a generallyconical arrangement from the body. The rounded ends of these fingersengage the rear of sealing ring 61 to maintain engagement of the latterwith a mating ring 66. Other types of spring, for example one in whichspring fingers are struck out from an annular body in a circumberestrainingly engaged by the radially spun lip 57 of' outer casingmember 50, as illustrated in Fig. 3, thus to restrain separation of the.casing members and associated parts when the seal is not installed.

Inner casing member 67 has a radially extending rear wall 70 whichaxially sustains the mating ring against the force of spring 63, therebeing a sealing gasket 71 interposed between the mating ring and thewall;

' Casing member 67 is restrained from rotation relative to a sealed partwith which it is associated, for example, the flanged shaft hub 72 shownin Fig. 4, by means of a number of axially extending pins 73 secured tocasing wall 70. The forward extremities of these pins extend throughapertures in gasket 71 and are received in rear recesses 74 of themating ring; the rear extremities thereof serve to center anoutersealing gasket 75 associated with the casing, and are received ininterlocking recesses 76 formed in the part 72.

The seals described above are similar in their operatingcharacteristics. Entry of dirt or foreign matter, or escape of oil orother liquid between the outer casing and sealing ring is prevented bythe diaphragm. The running seal between the mating and sealing ringsacts similarly with regard to the opening between the casing members andthe shaft space internally of the seal. Both vseals are entirelyself-contained and are responsive Without loss of efliciency to end playin operation of the installation. A minimum ofvparts is employedin theinterest of low production cost and the cost of installation is alsomaintained at a minimum by the Iarrangements described.

I claim:

l. A self-contained seal for a pair of relatively rotatable parts,comprising an annular easing made up of a first casing member adapted tobe disposedl in fixed relation to one of said parts, and a second'annular casing member mounted in coaxial axially telescoped relation tosaid first casing member and adapted to be disposed in fixed relation tothe other of said parts, a sealing ring associated in concentric axiallymovable relation to said first casing member, means restraining relativerotation of said sealing ring and its casing member, a flexible annularsealing diaphragm secured at opposite margins to said sealing ring andits associated casing member, a mating ring axially abutted andsustained by said second casing member in relatively rotatableengagement with said sealing ring, and spring means acting axiallybetween said sealing ring and its associated casing member tourge saidrings against one another and to maintain said mating: ring in axialabutment with its casing member, said second casing member having asleeve portion extending axially toward 'engaging surfaces of= saidsealing and mating rings, which sleeve portion is provided with integralelements extending in opposite radial directions therefrom and engagingsaid mating ring and said: fir-st. casing member, respectively, torestrainrotation of said mating ring relative to said second casingmember and to prevent axial separation of said casingfmembersunder theforce of said springmeans.

2. A selfacontained seal in accordance with claim 1 inwhich` said firstcasing member includes: an axially extending outer, portion telescopedwithin said second casing member and in which a rigid clamp ring isfrictionally telescopedin said-portion to secure one margin of`saiddiaphragm. thereto.

3; A self-contained seal for a pair of' relatively rotatable parts,comprising an annular casing made up offatfirsty casing member adaptedtobe` disposed .iny fixed relation toone oflsaid'parts,'and a secondannular casing member mountedY in coaxial axially telescoped relation tosaid first casing member and adapted to be disposed in fixed relation tothe other of said parts, a sealing ring associated in concentric axiallymovable relation to said first casing member, means restraining relativerotation of said sealing ring and its casing member, a flexible annularsealing diaphragm secured at opposite margins to said sealing ring andits associated casing member, a

mating ring loosely received in and axially abutted` and sustained bysaid second casing member in relatively rotatable engagement with saidsealing ring, and spring means acting axially between said sealing ringandv its associated casing member to urge said rings against one anotherand to maintain said mating ring in axial abutment with its casingmember, said second casing member having a sleeve portion extendingaxially toward engaging surfaces of said sealing and mating rings, whichsleeve portion is provided with integralv elements extending in oppositeradial directions therefrom and= engaging said mating ring and saidfirst casing member, respectively, to restrain rotation of said matingring relative to said second casing member and to prevent axialseparation of said casing members under the force of saidV spring means.

4. A self-contained seal for a pairl of relatively rotatable parts,comprising an annular casing made up of a first casing member adapted tobe disposed in fixed relation to one of saidl parts,'and a secondannular casing member mounted in a coaxial relation to said firstcas-ing member and adaptedA to be disposed in fixedrelation to the otherof Isaid parts, a sealing ring assof ciated in concentric, axiallymovable relation to saidd'lrstr casing member, means restrainingrelative rotation of said= sealing ring and casing member, a flexibleannular diaphragm secured at opposite margins to said sealing ring andits associated casingl member, said' second casing member having anouter portion of substantial length adapted to be frictionally engagedwith one of said sealed parts and a re-entrant axially extending portiondefining' an annular recess between the same and said outer portion, amating ring loosely received' in said recess andaxially abutted andsustained by said second casing member in relatively rotatableengagement with said sealing ring, and spring means acting axiallybetween saidsealing ring and its associated casing member tol urgeA saidrings against one another and to maintain said mating ring in axialabutment with its casingV member, said? re-entrant, axially extendingportion of saidcasingY member being provided with integral elementsextendingV therefrom in opposite radial directions, which elementsengage said mating ring and `said first casing member, respectively, torestrain rotation of said matingringrelative' to said second member andto prevent separation of said casing members under the force of saidspring means.

5. A self-contained seal for a pair of relativelyl rotatable parts,comprising an annular casing made up of a first casing member adapted tobe disposed in fixed relation to one of said parts, and a second annularcasing member mounted in a coaxial relation to said first casing memberand adapted to be disposed in fixed relation to the other of said parts,a sealing ringassoc-ia-tedin concentric, axially movable relation tosaid first casing member, means restraining relative rotation of-saidfsealing ring and casing member, a flexible annular diaphragmYsecured at opposite marginsto said sealing ringand` saidV rst casingmember, said first casing member includinga radial rear wall and aninner tubular portion ofi substantial length extending forwardly fromsaid rear wall,

said second casing member having an outer portion oifv substantiallength adapted to be frictionally engaged with one of said sealed partsand a re-entrant axially extending portion defining an annular recessbetween the same and said outer portion, a mating ring loosely receivedin said recess andaxially abuttedand' sustained by said second casingmember in relatively rotatable engagement with said sealing ring, andspring means acting axially between said sealing ring and its associatedcasing member to urge said rings against one another' and to maintainsaid mating ring in axial abutment with said second casing member, saidre-entrant, axially extending portion of said second casing memberhaving integral elements extending in opposite radial directionstherefrom to engage said mating ring and said inner tubular portion ofsaid first casing member, respectively, to restrain rotation of saidmating ring relative to said second casing member and to preventseparation of said casing members under the force of said spring means.

6. A self-contained seal in accordance with claim in which said innertubular portion of said first sealing ring casing member is ofsufficient length to telescope entirely through said second mating ringcasing member when the seal is axially compressed, for axial abutmentwith a part immediately to the rear of said second casing member.

7. A self-contained seal for a pair of relatively rotatable parts,comprising a first annular casing member adapted to be disposed in fixedrelation to one of said parts, a second' annular casing member mountedin a coaxial relation to said first casing member and adapted to bedisposed in fixed relation to the other of said parts, a sealing ringassociated in concentric, axially movable relation to said first casingmember, means restraining relative rotation of said sealing ring andfirst casing member, a flexible annular diaphragm secured at oppositemargins to said Sealing ring and said rst casing member, said rst casingmember including a radial rear wall and an inner tubular portion ofsubstantial length extending forwardly from said ,rear wall, said secondcasing member having an outer portion of substantial length adapted tobe frictionally engaged with one of said sealed parts and an integral,re-entrant axially extending portion disposed radially inwardly of saidouter portion and dening an annular recess between the same and saidouter portions, a mating ring loosely received in said recess andaxially abutted and sustained by said second casing member in relativelyrotatable engagement with said sealing ring, coacting axially telescopedmeans on said second casing member and mating ring positivelyrestraining relative rotation thereof, and spring means acting axiallybetween said sealing ring and said first casing member to urge saidrings against one another and to maintain said mating ring in axialabutment with said second casing member, said casing members havingcoacting elements on the inner tubular portion of one and on there-entrant portion rof the other which are engageable to preventseparation of the members.

8. A self-contained seal comprising an annular casing made up of a firstcasing member, a second casing member coaxial therewith, each of saidcasing members having a ring in coaxial, non-rotative relation thereto,said rings being in relatively rotative, slidable engagement with oneanother, said first casing including an annular, axially extendingsleeve of substantial length about which the ring of that casing memberis telescoped, said second casing member including a means defining are-entrant recess in which the ring of said second casing member isreceived, said recess defining means including an axially extending,sleeve-like flange portion, said flange portion having an integralelement thereon extending radially to engage a portion of the sleeve ofsaid first casing member to prevent separation of the casing members,and having a further integral element thereon ex tending radially in theopposite direction to engage and prevent rotation of the ring of saidsecond casing member ingmember mounted in coaxial axially telescopedrelation to said first casing member and adapted to be disposed in fixedrelation to the other of said parts, a seal ing ring associated inconcentric axially movable relation to said first casing member, meansrestraining relative rotation of said sealing ring and its casingmember, means sealing said sealing ring in relation to said first casingmember, a mating ring axially abutted and sustained by said secondcasing member in relatively rotatable engagement with said sealing ring,and spring means acting axialiy between said sealing ring and itsassociate-d casing member to urge said rings against one another and tomaintain said mating ring in axial abutment with its casing member, saidsecond casing member having a sleeve portion extending axially towardengaging surfaces of said sealing and mating rings, which sleeve portionis provided with integral elements extending in opposite radialdirections therefrom and engaging said mating ring and said first casingmember, respectively, to restrain rotation of said mating ring relativeto said second casing member and to prevent axial separation of saidcasing members under the force of said spring means.

10. A self-contained seal for a pair of relatively rotatable parts,comprising an annular casing made up of 'ing member mounted in a coaxialrelation to said first casing member and adapted to be disposed in fixedrelation to the other of said parts, a sealing ring associated inconcentric, axially movable relation to said first casing member, meansrestraining relative rotation yof said sealing ring and casing member,means sealing said lsealing ring in relation to said first casingmember, said second casing member having an outer portion of substantiallength adapted to be frictionally engaged with one of said sealed partsand a re-entrant axially extending portion defining an annular recessbetween the same and said outer portion, a mating ring loosely receivedin said recess and axially abutted and sustained by said second casingmember in relatively rotatable engagement with said sealing ring, andspring means acting axially between said sealing ring and its associatedcasing member to urge said rings against one another and to maintainsaid mating ring in axial abutment with its casing member, saidre-entrant, axially extending portion of said casing member beingprovided with integral elements extending therefrom in opposite radialdirections, which elements engage said mating ring and said first casingmember, respectively, to restrain rotation of said mating ring relativeto said second casing member and to prevent separation of said casingmembers under the force of said spring means.

11. A self-contained seal for a pair of relatively rotatable parts,comprising a first annular casing member adapted to be disposed in fixedrelation to one of said parts, a second annular casing member mounted ineoaxial, axially telescoped relation to said first casing member andadapted to be disposed in fixed relation to the other of said parts, asealing ring associated in concentric, axially movable relation to saidfirst casing mem-ber, means restraining relative rotation of saidsealing ring and said first casing member, means sealing said sealingring in relation to said first casing member, a mating ring looselydisposed in and axially abutted and sustained by said second casingmember for relatively rotative engagement with said sealing ring, andspring means acting axially between said sealing ring and said firstcasing member to urge said rings against one another and to maintainsaid mating ring in axial abutment with. said second casing member, saidsecond casing member having integral elements engaging said mating ringand said first casing member, respectively, to restrain rotation of saidmating ring relative to said second casing member and to prevent axialseparation of said casing members under the force of said spring means.

means sealing said sealing ring in relation to said first casing member,a mating ring loosely disposed in and axially abutted and sustained bysaid second casing member for relatively rotative engagement with saidsealing ring, and spring means, acting axially between saidysealingfr'ing andA said first casing member to urge said rings againstone another and to maintain, said mating ring iry axial abutment withsaid second casing member, said second casingV member having a sleeveportion provided with integral elements engaging said mating ring andsaid first casing member, respectively, to restrain rotation of saidmating ring relative to said second casing member and to prevent axialseparation of said casing members under the force of said spring means.

13. A self-contained seal for a pair of relatively rotatable parts,comprising a first annular casing member adapted to be disposed in fixedrelation to one of said parts, a second annular casing member mounted incoaxial, axially telescoped relation' to said first casing member andadapted to Ibe disposed in fixed relation to the other of said parts, asealing ring associated in concentric, axially movable relation to saidfirst casing member, means restraining relative rotation of said sealingring and said first casing member, means sealing said sealing ring inrelation to said first casing member, a mating ring loosely disposed inand axially abutted and sustained by said second casing member forrelatively rotative engagement with said sealing ring, and spring meansacting axially between said sealing ring and said first casing mem-berto urge said rings against one another and to maintain said mating ringin axial abutment with said second casing member, said second casingmember having a sleeve portion extending axially toward engagingsurfaces of said sealing and mating rings, which sleeve portion isprovided with integral elements extending in opposite radial directionstherefrom and engaging said mating ring and said first casing member,respectively, to restrain rotation of said mating ring relative to saidsecond casing member and to prevent axial separation of said casingmembers under the force of said spring means. l

14. A self-contained seal for a pair of relatively rotatable parts,comprising a first annular casing member adapted to be disposed in fixedrelation to one of said parts, a second annular casing mem-ber mountedin coaxial, axially telescoped relation to said first casing member andadapted to be disposed in fixed relation to the other of said parts, asealing ring associated in concentric, axially movable relation to saidfirst casing member, means restraining relative rotation of said sealingring and said first casing member, a fiexible annular sealing diaphragmsecured at opposite margins to said sealing ring and said first casingmember, a mating ring loosely disposed in and axially abutted andsustained by said second casing member for relatively rotativeengagement with said sealing ring, and spring means acting axiallybetween said sealing ring and said first casing member tc urge saidrings against one another and to maintain said mating ring in axialabutment with said second casing member, vsaid second casing memberhaving a sleeve portion provided with integral elements engaging saidmating ring and said first casing member, respectively, to restrainrotation of said mating ring relative to said second casing member andto prevent axial separation of said casing members under the force ofsaid spring means.

15. A self-contained seal for -a pair of relatively ro- `10 retableentre. Comprising in annular casing member adapted for mounting toone ofsaid parts against rotation relative thereto, said casing member havingan axially extending portion formed integral therewith and defining theinner surface of said seal to b e received about a shaft, a sealing ringreceived about the outer periphery of said axially extending portion,said sealing ring being movable in on axial direction along said axiallyextending portion, said casing member including a radially directed' endwall portion through which is received 'ut least one` pin-liker elementwhich is axially directed and which pro,- vides one end portionexternally of said casing member to mount the same and another endportion received within a recess in said sealing ring internally of saidcasing member to prevent rotation of said sealing ring relative to saidcasing member, @mating ring received aboutthe outer periphery of saidaxially extending portioyn and being axially movable therealong in the.unmounted condition of said seal, means associated with said mattingring to mount the same to the other of said parts against rotationrelative thereto, spring m'eans carried between said casing member andsdid sealing ring and urging said sealing ring into radial face-to-facecontact with said mating ring, and outwardly directed lug means forminga part of said axially extending portion near the free edge thereof andprojecting into the path of axial movement of said mating ring alongsaid axially extending portion to contact the same und prevent axialseparation 0f said mating ring from said casing member inthe unmountedcondition of said seal,

16. A self-contained seal for a pair of relatively rotatable parts,comprising an annular casing member adapted for mounting to one of saidparts against rotation relative thereto, said casing member having anaxially extending portion formed integral therewith and de'- ning theinner surface of said seul to be received about a shaft, a sealing ringreceived about the outer periphery of said axially extending portion,said sealing ring being movable in on axial direction along said axiallyextending portion, said casing member including a radially directed endwall portion through which is received at least one pin-like elementwhich is axially directed and which provides one end portion externallyof said casing member to mount the same and another end portion receivedwithin u recess of said sealing ring internally of said casing member toprevent rotation of said sealing ring relative to said casing member, adiaphragm interconnecting said sealing ring with said casing member, amating ring assembly received about the outer periphery of said axiallyextending portion and being axially movable therealong in the unmountedcondition of said seal, means associated with said mating ring assemblyto mount the same to the other of said parts against rotation relativethereto, spring means carried between said casing member and saidsealing ring and urging said sealing ring into radial face-to-faceContact with a mating surface of said mating ring assembly, andoutwardly directed lug means forming a part of said axially extendingportion near the free edge thereof and projecting into the path of axialmovement of said mating ring assembly along said axially extendingportion to contact means forming a p-art thereof and prevent axialseparation of said mating ring assembly from said casing member in theunmounted condition of said seal.

17. A self-contained seal for mounting between a pair of opposed radialvportions of relatively rotatable parts in axially spaced relationsurrounding a shaft, said seal comprising u lrst annuler casing memberadapted for mounting to one of said parts against rotation relativethereto, said first casing member having a radially directed end wallportion and un axially extending portion formed integral therewith andde ning the inner surface of said seal to be received about said shaftin radially spaced relation thereto, a sealing ring received about theouter periphery of said axially extending portion in as- 1l sociationwith said end wall portion, said sealing ring being movable in an axialdirection along said axially extending portion and being held againstrotation relative to said rst casing member by engaging means carried bysaid first casing member, a diaphragm interconnecting said sealing ringwith the end wall portion of said first casing member, a mating ringreceived about the outer periphery of said axially extending portion andbeing axially movable therealong in the unmounted condition of saidseal, a second casing mem-ber associated with said mating ring to mountthe same to the other of said parts against rotation relative thereto,said second casing member including an annular recess in which saidmating ring is loosely received, spring means carried between the endwall portion of said jrst casing member and said sealing ring and urgingsaid sealing ring into radial face-to-face contact with said mating ringto axially abut and sustain said mating ring in the recess of saidsecond casing mem- References Cited in the le of this patent or theoriginal patent UNITED STATES PATENTS 2,322,834 Dernhofer June 29, 19432,472,264 Payne June 7, 1949 2,489,781 Isenbarger Nov. 29, 19492,500,898 Hastings Mar. 14, 1950 2,615,739 Vedovell Oct. 28, 1952

